By obtaining Bargain Coupon item, players can trade it for exclusive weapons with good discount. The Coupon cannot be bought in the Item Shop, it's only obtainable via publishers' event Bargain Coupon can be found inside players' storage after acquiring them. Clicking "Use" button will display a Buy Menu which allows players to choose exclusive prize to buy. Once bought, the weapon will be available in the storage and the Coupon will disappear. Players can then renew the weapon's rent time with normal price - if the weapon disappears, it's impossible to regain it without the use of another Bargain Coupon.